| H & H Installations SW Ltd | Construction | 2023 |
| H J Irons Engineering Consultants Limited | Professional & scientific | 2013 |
| Hacks Equestrian Saltash Ltd | Wholesale & retail | 2025 |
| Halo Consultancy Services Ltd | Health & social care | 2022 |
| Hand in Hand Distribution Limited | Wholesale & retail | 1998 |
| Handepropertymanagement Ltd | Real estate | 2025 |
| Hannaford Property Ltd | Real estate | 2025 |
| Hannafordhomes Ltd | Real estate | 2018 |
| Harger Limited | Construction | 2023 |
| Harkin Holdings (SW) Limited | Real estate | 2023 |
| Harkin Investments SW Limited | Financial services | 2025 |
| Harlyn Sands Limited | Hospitality | 1977 |
| Hatt Service Centre Limited | Wholesale & retail | 2003 |
| Hatt Service Station Ltd | Wholesale & retail | 2017 |
| HCC Consultants Limited | Construction | 2022 |
| HCC Holdings and Investments Ltd | Financial services | 2025 |
| HD Bespoke Development Ltd | Construction | 2025 |
| Herlab Ltd | Professional & scientific | 2022 |
| HH Consultancy Solutions Limited | Health & social care | 2016 |
| Hicks Construction Ltd | Construction | 2015 |
| Higginson Professional Services Limited | Other services | 2019 |
| Hillside Home Services Ltd | Construction | 2022 |
| Hispania Tasty by Mavi Ltd | Hospitality | 2023 |
| HK Pet Supplies Limited | Wholesale & retail | 2018 |
| Hodge Electrical & Mechanical Ltd | Construction | 2004 |
| Hodler Ltd | Professional & scientific | 2020 |
| Holman Finance International Limited | Financial services | 2019 |
| Holmbush Commercials Ltd | Administrative & support | 2014 |
| Homewell Plus Limited | Administrative & support | 2016 |
| Howies Grill Ltd | Hospitality | 2026 |
| Href Media Ltd | Information & communication | 2012 |
| Hughes Massie Limited | Information & communication | 1961 |
| Human Digital Twin Ltd | Information & communication | 2024 |
| Hurricane Pharmaceuticals Limited | Wholesale & retail | 2020 |
| I Broad Property Services Ltd | Construction | 2015 |
| I R & H E Davey Ltd | Agriculture & fishing | 2015 |
| IAN Duffie Surveying Limited | Professional & scientific | 2015 |
| Icey Motors Ltd | Wholesale & retail | 2025 |
| Ichor Consultancy Limited | Professional & scientific | 2017 |
| ID Pharma Consultancy Ltd | Professional & scientific | 2023 |
| Ideal Ohms Ltd | Construction | 2026 |
| IK Consultancy Limited | Professional & scientific | 2013 |
| Ikigai Print Ltd | Wholesale & retail | 2019 |
| Impact Accounting (South West) LLP | | 2008 |
| Implant Surgeon Limited | Health & social care | 2014 |
| Independent Family Social Work Ltd. | Health & social care | 2023 |
| Independent Maintenance Consulting Limited | Professional & scientific | 2010 |
| Independent Slate Supplies Limited | Wholesale & retail | 1992 |
| Ings Properties Ltd | Real estate | 2020 |
| INJ Consulting Ltd | Professional & scientific | 2012 |
| Inkphoria Studio Ltd | Other services | 2024 |
| Intercress Limited | Information & communication | 1993 |
| IPB Services Ltd | Manufacturing | 2022 |
| J & B Car Sales Ltd | Wholesale & retail | 2010 |
| J.Watson Brickworks Ltd | Construction | 2025 |
| James Davey Hoof Trimming Ltd | Agriculture & fishing | 2024 |
| James Harvey Plumbing Ltd | Construction | 2022 |
| Janner Infrastructure Ltd | Construction | 2025 |
| JC Precision Plastering Limited | Construction | 2026 |
| Jcom Consulting Ltd | Professional & scientific | 2025 |
| JFK Lettings Ltd | Real estate | 2026 |
| JM Racewheels Ltd | Wholesale & retail | 2026 |
| Joanna Elder Consulting Ltd | Wholesale & retail | 2025 |
| John Cotter Scaffolding, EST 1976 Ltd | Construction | 2020 |
| Joint Workshop Ltd | Manufacturing | 2026 |
| Jolloi Limited | Administrative & support | 2014 |
| JON Holmes Consultants Limited | Transport & logistics | 2014 |
| Jones Legal Services Ltd | Professional & scientific | 2026 |
| JP Tools (South West) Limited | Wholesale & retail | 2020 |
| JSG Construction & Home Improvements Ltd | Construction | 2022 |
| JT Fencing Limited | Construction | 2023 |
| Julie Poole Ltd | Health & social care | 2019 |
| Justownyou Limited | Health & social care | 2015 |
| Juswonmoor NMP Services Limited | Health & social care | 2025 |
| K & K Holdings Limited | Wholesale & retail | 2016 |
| K J R Developers Limited | Real estate | 2022 |
| K. Martin Engineering Limited | | 1983 |
| K7 Safety Limited | Professional & scientific | 2015 |
| K9 Inspired Country Retreat Ltd | Other services | 2023 |
| Kaptivate Ltd | Extraterritorial | 2013 |
| Kaptivate Solutions Ltd | Administrative & support | 2014 |
| Karn Building Solutions Ltd | Construction | 2025 |
| Karn Developments Ltd | Construction | 2024 |
| Karn Holdings Ltd | Financial services | 2026 |
| Karn Properties Ltd | Construction | 2025 |
| KAS Prints Ltd | Professional & scientific | 2026 |
| Kasc Property Limited | Real estate | 2018 |
| KC Screen Printing Limited | Manufacturing | 2012 |
| KCC Builders Ltd | Construction | 2013 |
| Keltic Holdings PLC | | 1990 |
| Kenwyn House Developments Limited | Real estate | 2022 |
| Kenyon Canopy (Slate & Stone) Ltd | Wholesale & retail | 2009 |
| Kerenza (SW) Ltd | Financial services | 2022 |
| Kernow Auto Vehicle Enhancements Ltd | Wholesale & retail | 2024 |
| Kernow Carveries Saltash Limited | Hospitality | 2015 |
| Kernow Cleaners Ltd | Other services | 2003 |
| Kernow Feeds Limited | Manufacturing | 2021 |
| Kernow Pro Finish Ltd | Construction | 2026 |
| Kernow Property Developments Limited | Real estate | 2004 |
| Kernow Scrap & Waste Solutions Ltd | Water & waste | 2025 |